geeg-et



(No Model.) 4 Sheets-Sheet 1.

L. GREGBT,

PROPELLER.

No. 387.783. Patented Aug. 14, 1888.

WITNEs INVENTOR: 4 WM h I ATTORNEYS.

(No Model.)

4 Sheets-Sheet 2. L. GREGET.

PROPELLBR.

Patented Aug. 14, 1888.

FM a E S .Hlib

m- H H :1 R

\IHH

INVENTOR:

WITNE S:

ATTORNEYS.

4 Sheets--Sheet 3.

(No Model.)

L. GREGET.

PROPELLER.

Patented Aug. 14, 1888.

4 INVENTOR:

ATTORNEYS N PETERS, Pmm-uxho n w, Walhmginn. u c.

(No Modl.) 4 Sheets-Sheet 4.

L. GREGET.

PROPELLBR.

No. 387,783. Patented Aug. 14, 1888.

IN VENTOR N. PETERS. Mo-Uhbgnpfhr, Washington. ac.

LOUIS cancer, on

PATENT tribe.

NEW roan, N. Y.

PROPELLER.

SPECIFICATION forming part of Letters Application filed March 3, 1888.

To all whom it may concern.-

Be it known that I, LOUIS GREGET, of the city, county, and State of NewYork, have in vented a new and useful Improvementin Propellers, of whichthe following is a full, clear, and exact description.

Reference is to be had to the accompanying d rawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a front elevation of my new and improved propeller. Fig. 2is a plan view of the same with the deck broken away. Fig. 3 is alongitudinal sectional elevation taken on the line :0 a: of Fig. 2, andFig. 4 is a sectional elevation of a canal-boat constructed in accordance with my invention.

The object of my invention is to attain high speed in the propulsion ofvessels; and to this end my invention consists,principally,inconstructing the vessel with twin hulls suitably spaced, combined withtwo series of paddles operated alternately, each series by twocrankshafts.

The invention also consists in attaching the blades of the propellers ata slight angle to the main bars thereof, so that said blades will pitchslightly forward, so that they will leave the water withoutback-pressure.

The invention finally consists in forming the cranks of the stern seriesof propellers of greater length than the forward cranks, so that thestern propellers will dip below the agitation of the water caused by thebow propellers, and thus act upon still water.

The body A of the vessel is constructed in this instance with only onedeck, 13. From this deck at each side of the vessel is constructed ahull, 0, each with a keel, G, of equal dimensions, so that the vessel isformed with two complete hulls, as shown clearly in Fig. 1. Jonrnaled inthe adjacent sides of the hulls C C are four bent crank-shafts, .D D andD D, the cranks d d and d d of which stand in the center of the spacebetween the said hulls C C. To the forward cranks, d d, are connected.by journal-blocks E E the two Patent No. 387,783, dated August 14, 1888.

Serial No. 266,041. (No model.)

the propeller-blades F, four in number in this instance, and theseblades project slightly forward and downward, as shown clearly in Fig.3.

To the rear cranks, d d, are connected by journal -blocks G G the twoparallel bars G G, to which are connected the rear propeller-blades, H,also four in number, and these blades also project slightly forward, asshown in Fig. 3, and the rear cranks, d d, are somewhat longer than thebow cranks d (I, so that the rear propeller-blades, H, will dip lowerthan the front blades, F, and have a somewhat faster speed, so that thesaid blades will act upon still water below the agitation and run of thewater caused by the blades F.

The shafts D D are provided at each end with a crank-wheel, J, thecrank-pin of which is connected to the long con necting-bars K K, whichwill be reciprocated by steam-engines (not shown) for turning the saidcrank-shafts for operating the propeller-blades and pro pelling thevessel.

The rear shafts, D D, have the opposite arrangement to the shaftsD--that is to say, they are arranged so that the cranks (2 thereforstand above the journal at the time the cranks d of the shafts D standbelow their journals-so that the propeller-blades will have alternatemovement, only one set performing work at a time. In this manner thereis a constant propelling action exerted upon the vessel, so that themotion is continuous.

In Fig. 4, which shows the canal-boat construction, the spaced or twinhulls C reach only from the bow to about inidships, where a partition,M, is formed extending the hold at the stern nearly to the heels G.Attached to the bottom of the partition M is the bottom N, which isinclined downward and rearward nearly to the rudder P. This inclinedbottom is fitted at its side edges between the bulls C C, and with saidhulls forms a tapering bottom passage, 0, which confines the currentproduced by the paddles H H and directs said current directly astern,and this parallel bars, E E, to which are connected prevents sidewashing of the canal.

d li

Having thus described my invention, what I length than the cranks (Z (Zof the front shafts, claim as new, and desire to secure by Letters D D,the bars G, connected to the cranks d, IO Patent, is and the blades H,attached to the bars, sub- The body A of the vessel, constructed withstantially as described.

5 the two hulls O O, the two shafts D D, cranks LOUIS GREGET.

d d thereof, bars E, and blades F, attached to \Vitnesses: the saidcranks, in combination with the two lVIICHAEL DONNELLON. stern shafts DD, cranks d d, of greater PETER E. DONNELLON.

